Assembly of Multi-Spheroid Cellular Architectures by Programmable Droplet Merging

Area of Science:

• Biotechnology and Biomedical Engineering
• Tissue Engineering and Regenerative Medicine

Background:

• Reconstructing complex tissue architectures in vitro is crucial for tissue engineering and regenerative medicine.
• Current methods lack controllability and high-throughput capabilities for fabricating complex multicellular systems.

Purpose of the Study:

• To develop a facile and high-throughput method for programmed assembly of multiple cell spheroids into complex multicellular architectures.
• To demonstrate the utility of this method for studying biological processes like cell signaling.

Main Methods:

• A tunable droplet-fusion technique was developed for controlled assembly of cell spheroids.
• Miniaturized high-density arrays were used to create various multicellular architectures (double-spheroids, multi-spheroids, hetero-spheroids).
• Wnt signaling propagation was investigated in hetero-spheroids composed of Wnt-releasing and Wnt-reporter cell spheroids.

Main Results:

• The droplet-fusion technique successfully enabled the construction of diverse multicellular architectures in a high-throughput manner.
• The method allowed for programmed assembly of cell spheroids into complex 3D structures.
• Investigation of Wnt signaling propagation within engineered hetero-spheroids was demonstrated.

Conclusions:

• The developed droplet-fusion method offers a powerful approach for miniaturized, high-throughput construction of complex 3D multicellular architectures.
• This technique has broad applications in studying cell signaling, cancer invasion, embryogenesis, and neural development.
• The method facilitates advancements in tissue engineering and regenerative medicine research.